Did you enable the plugin??
I zipped it, and attached it, good luck!
As Robert said:
"To install, just download and save the wordnet.uhp in Hal's program folder (usually c:program files\zabawareultra hal assistant 6) and then go into Hal's options, Brain section, and check "WordNet Antonym & Meronym" under additional brain plug-ins."
Download Attachment: wordnet.zip2.27 KB